Mike, I'm not trying to give you a bad time, and I'll admit that British officers are boring, but where did they find a drill press on the Western front? That unstable bullet did terrible things in flesh without a hollow point and anyway, velocity of 650 will not open out a hp much.
It was the Mk VI Webley. I turned my cylinder so it would accept .45acp in moon clips, but .45 auto rim cases don't need a clip to extract.
You are talking about .452 vs .454. You fire only moderate loads and use only lead bullets there is no blowby. Lyman mould #454424 sized to .454 is a perfect fit in the bore and loads into the case perfectly if you use the correct neck sizing plug.
My wife keeps ours in a kitchen drawer and, yes, she has used it to discourage an intruder. Something about an angry woman pointing a very large revolver.
I'm a shooter, not a militaria collector, so I turned the cylinder so I could shoot the beast with available brass.